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LM5118 or LM25118 in >200VDC application

Girish Ramachandran1
Prodigy 70 points
Other Parts Discussed in Thread: LM5118, LM25118, TINA-TI

Hello

I am interested in using the LM5118 or the LM25118 as a controller for a buck-boost topology where the input voltage varies from 100V-400V DC and the output needs to be regulated to 200V DC.

- Can I run the controller chip from a low voltage (~20VDC ) isolated power supply and connect just feedback divided down from high voltage back to chip?

- I tried simulating using TINA-TI for LM25118, but I am unable to get the simulation to work. I suspect I am not handling the Vout, HB, HS pins appropriately since I cannot connect them to high voltage. Any thoughts?

- If this chip cannot be used for this application, any other suggestions for controller chips that might work for this application?

Thanks